Each digit differs from the next one by 1

April 26, 2022

Script has to work this way:

isJumping(9) === 'JUMPING'

This is a one digit number

isJumping(79) === 'NOT JUMPING'

Neighboring digits do not differ by 1

isJumping(23454) === 'JUMPING'

Neighboring digits differ by 1

I have:

function isJumping(number) {
    let str = number.toString();
    for (let i = 1; i < str.length; i++) {
        if (Math.abs(str[i+1]) - Math.abs(str[i]) == 1){
            return 'JUMPING';
        }
    }
    return 'NOT JUMPING';
}
console.log(isJumping(345));

Help please, where is mistake?

>Solution :

Loop over the characters and early return with "NOT JUMPING" if the condition is violated & if the condition is never violated return "JUMPING".

function isJumping(num) {
  const strNum = String(Math.abs(num));

  for (let i = 0; i < strNum.length - 1; i++) {
    if (Math.abs(strNum[i] - strNum[i + 1]) > 1) {
      // replace `> 1` with `!== 1`, if diff 0 is not valid!
      return "NOT JUMPING";
    }
  }

  return "JUMPING";
}

console.log(isJumping(9));
console.log(isJumping(79));
console.log(isJumping(23454));